cpu/stm32l4: add missing PORT_I enum
cpu/stm32l4: add missing PORT_I enum

authmillenon/RIOT,OlegHahm/RIOT,basilfx/RIOT,miri64/RIOT,OTAkeys/RIOT,kYc0o/RIOT,rfuentess/RIOT,kaspar030/RIOT,josephnoir/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,toonst/RIOT,jasonatran/RIOT,smlng/RIOT,toonst/RIOT,kaspar030/RIOT,OlegHahm/RIOT,ant9000/RIOT,kaspar030/RIOT,smlng/RIOT,basilfx/RIOT,authmillenon/RIOT,yogo1212/RIOT,miri64/RIOT,x3ro/RIOT,smlng/RIOT,x3ro/RIOT,toonst/RIOT,OlegHahm/RIOT,jasonatran/RIOT,mtausig/RIOT,ant9000/RIOT,aeneby/RIOT,rfuentess/RIOT,basilfx/RIOT,aeneby/RIOT,josephnoir/RIOT,miri64/RIOT,mtausig/RIOT,jasonatran/RIOT,authmillenon/RIOT,toonst/RIOT,mtausig/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,yogo1212/RIOT,authmillenon/RIOT,yogo1212/RIOT,aeneby/RIOT,rfuentess/RIOT,jasonatran/RIOT,kaspar030/RIOT,authmillenon/RIOT,authmillenon/RIOT,basilfx/RIOT,kYc0o/RIOT,toonst/RIOT,josephnoir/RIOT,kYc0o/RIOT,aeneby/RIOT,x3ro/RIOT,OTAkeys/RIOT,mtausig/RIOT,kYc0o/RIOT,aeneby/RIOT,OlegHahm/RIOT,kYc0o/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,smlng/RIOT,rfuentess/RIOT,ant9000/RIOT,yogo1212/RIOT,x3ro/RIOT,RIOT-OS/RIOT,miri64/RIOT,jasonatran/RIOT,yogo1212/RIOT,miri64/RIOT,OTAkeys/RIOT,rfuentess/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,basilfx/RIOT,kaspar030/RIOT,mtausig/RIOT,josephnoir/RIOT,x3ro/RIOT,ant9000/RIOT,ant9000/RIOT,smlng/RIOT